After all, 16 hours is a long time to go without eating. Here’s everything you need to know about the popular weight-loss regimen—including whether it actually works.

illustration of a man eating while using a clock as a table

Illustration by Simon Abranowicz

Chris Pratt! Hugh Jackman! Halle Berry! Kourtney Kardashian! What these celebrities have in common, other than a gratuitous exclamation point after their names, is a professed fondness for intermittent fasting, the diet craze turning the fitness world on its sweaty, well-toned head. For help determining whether you, too, should incorporate this into your 2019 resolution-related plans, we asked a few experts to explain what it is, why people love it, and whether it’s really worth the pain of forgoing on-demand snacks for the rest of the winter.

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